Latest Elitmus Aptitude Question SOLUTION: In a purse, there are 30 coins, twenty one-rupee and remaining 50-paise coins. Eleven coins are picked simultaneously at random and placed in a box. If a coin is now picked from th

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(#M40039350) ELITMUS Numerical Ability question quant Keep an EYE

In a purse, there are 30 coins, twenty one-rupee and remaining 50-paise coins. Eleven coins are picked simultaneously at random and placed in a box. If a coin is now picked from the box, find the probability of it being a rupee coin.

Asked In Elitmus Kumar Vikash (9 years ago)

Unsolved Read Solution (28)

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Read Solution (28) :

sachin pal  (9 years ago)

it will be 2/3.
initial probability is 2/3
so no matter how many u choose it will always remain 2/3

Is this solution Helpfull? Yes (25) | No (8)  

Ashvini Mandloi  (9 years ago)

total coins 30
1 rupee coins 20
50 paise coins 10

1 rupee coin probability 20C11
11 coin are picked 30C11
ans should be= 20C11/30C11

Is this solution Helpfull? Yes (12) | No (12)  

KANHAIYA  (9 years ago)

@ moumita das : there is some posibilities
rupee : 50 paisa probabilitie
11 0 1 or 11/11
10 1 10/11
9 2 9/11
8 3 8/11
... ... 7/11
6/11
5/11
4/11
3/11
2/11
1 10 1/11

THEN you can find that 1+2+3+......+11 =66 therefore 66/11
and these are 11 case so 66/11*11= 6/11

Is this solution Helpfull? Yes (9) | No (16)  

swarupa nuggu  (9 years ago)

we have to pick from the box of 11 coins, not from 30 coins purse.
then how it is 20c1/30c1?

Is this solution Helpfull? Yes (7) | No (1)  

md salman ansari  (9 years ago)

yar amcat question tmlog kyun dalte ho elitmus wale me.amcat wale ko amcat me dalo na faltu time west

Is this solution Helpfull? Yes (7) | No (2)  

bablu kumar  (9 years ago)

20c1/30c1=2/3

Is this solution Helpfull? Yes (6) | No (2)  

PIYA SHARMA  (9 years ago)

it will be : 2/3

Is this solution Helpfull? Yes (3) | No (1)  

mansi  (9 years ago)

BUT KANHYA LAL THERE IS NO OPTION CALLED 6/11

Is this solution Helpfull? Yes (3) | No (3)  

kollikishore  (9 years ago)

upto 66/11 it is ok.what is 66/11*11 ? you had already taken 11 cases so that u added all cases and got finally 66/11. pls explain @KANHAIYA

Is this solution Helpfull? Yes (2) | No   

RAJESH KUMAR  (9 years ago)

The answer is 1/2
because the chosen coin is either 1-rupee coin or either 50-paise coin.

Is this solution Helpfull? Yes (2) | No (5)  

shikhar garg  (9 years ago)

20c1/30c1, as we can select a rupee coin from 20 coinsand there are 30 coins in total from which we are picking one coin

Is this solution Helpfull? Yes (2) | No   

VIJAY BHARTI  (9 years ago)

20c1/30c1=2/3 ans

Is this solution Helpfull? Yes (1) | No (1)  

gopari rakesh  (9 years ago)

(2/3*11)
------------------------ =2/3
(2/3*11)+(1/3*11)

Is this solution Helpfull? Yes (1) | No   

amit kumar  (8 years ago)

20C11/30C11 = 2/3Ans

Is this solution Helpfull? Yes (1) | No (2)  

avnish  (7 years ago)

kanhaya bawala hy kya tane.. chor de padhna tane

Is this solution Helpfull? Yes (1) | No (1)  

KANHAIYA  (9 years ago)

it will be : 13/22

Is this solution Helpfull? Yes | No (5)  

KANHAIYA  (9 years ago)

sorry it typed by mistake
the probability of being a rupee is : 6/11

Is this solution Helpfull? Yes | No (5)  

Moumita Das  (9 years ago)

how ?? @kanhaiya lal ??

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KANHAIYA  (9 years ago)

@ PIYA SHARMA : how 2/3 ?

Is this solution Helpfull? Yes | No (1)  

nikita awasthi  (9 years ago)

if anybody can this question step by step plse explain ans is not clear wat is the correct ans for this question

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KANHAIYA  (9 years ago)

if anyone have correct ans. then plz tell.....

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KANHAIYA  (9 years ago)

@ MANSI but there is no option give in this question. so i can't say that my ans is correct or not...

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bablu kumar  (9 years ago)

21C2/30C2=14/29

Is this solution Helpfull? Yes | No   

Suryanshu Singh  (9 years ago)

it is a question of amcat.. the options are:
Option 1 : 4/7 Option 2 : 1/2 Option 3 : 2/3 Option 4 : 5/6

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RUPNATH HALDER  (9 years ago)

it must be 2/3

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VIBHAV MITTAL  (9 years ago)

20c1/30c1
2/3 ANS.....
WE HAVE 20 1RS COINS.AND WE HAVE TO SELECT 1 COIN SO 20c1
AND TOTAL WE HAVE 30c1

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rajat bhawsar  (7 years ago)

ans 6/11 is right

Is this solution Helpfull? Yes | No (3)  

Nishant kumar pandey  (6 years ago)

it will be 2/3,because there is 20 one rupee coin and 10 50-paise coin so probability for one rupee coin is 2/3.

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